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Summary of Significant Accounting Policies (Other Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | $ 88,470 | $ 98,702
Accumulated amortization | (26,438) | (23,459)
Intangible Assets, Net (Excluding Goodwill), Total | 62,032 | 75,243
Customer Lists [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 52,200 | 57,672
Accumulated amortization | (14,549) | (12,695)
Intangible Assets, Net (Excluding Goodwill), Total | 37,651 | 44,977
Trade Names [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 20,689 | 23,546
Accumulated amortization | (5,884) | (5,646)
Intangible Assets, Net (Excluding Goodwill), Total | 14,805 | 17,900
Technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 15,581 | 17,443
Accumulated amortization | (6,005) | (5,077)
Intangible Assets, Net (Excluding Goodwill), Total | $ 9,576 | 12,366
Other Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost |  | 41
Accumulated amortization |  | $ (41)

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